Intro to editing in Final Cut Pro

The term video editing refers both to broader stages of a project workflow and to very specific manual tasks that you do with clips in a project timeline.

Create a project: To create a movie in Final Cut Pro, you first create a project, which provides a record of your editing decisions and the media you use. See Create a new project in Final Cut Pro.
Make selections and add clips to the timeline: Adding and arranging clips in your project is the fundamental step in creating a movie with Final Cut Pro. You move and reorder clips in the timeline. See Intro to adding clips in Final Cut Pro, Arrange clips in the Final Cut Pro timeline, and Intro to audio in Final Cut Pro.
Cut and trim clips: Final Cut Pro provides a wide variety of tools for adjusting the start and end points of clips in the timeline and for controlling pacing from one shot to the next. See Intro to trimming in Final Cut Pro.
Further refine and adjust your project: Final Cut Pro provides many advanced editing tools that allow you to finish a highly polished movie with ease. See the topics in the advanced editing section.
Add effects and color correction: Finishing touches include visual effects and color correction. See Intro to effects in Final Cut Pro and Intro to color correction in Final Cut Pro.

The timeline index on the left, and the timeline on the right showing the primary storyline and connected video and audio clips

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Final Cut Pro X User Guide

Intro to editing in Final Cut Pro